Last night, I drove home with the heater turned off. The tach was fine.
This morning, I turned the heater back on. By the time I got to work, the tach
was reading 500-1000 RPM high.
The next test will be with the heater on, but no dash lights. I suspect the
problem will not occur -- that it needs a combination of heat from both sources.
Does that mean a bad transistor in the tach?
Matt
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